Global patent index - EP 0780356 B1

EP 0780356 B1 2000-08-23 - Method for preparing a solution of an alkali salt of anthrahydroquinone

Title (en)

Method for preparing a solution of an alkali salt of anthrahydroquinone

Title (de)

Verfahren zur Herstellung einer Lösung eines Alkalisalzes von Anthrahydrochinon

Title (fr)

Procédé pour la préparation d'une solution d'un sel alcalin d'anthrahydroquinone

Publication

EP 0780356 B1 (EN)

Application

EP 96119643 A

Priority

JP 33381895 A

Abstract (en)

[origin: EP0780356A2] A method for preparing a solution of an alkali salt of anthrahydroquinone, which comprises reacting a solution of an alkali salt of 1,4-dihydro-9,10-dihydroxyanthracene with anthraquinone in the presence of an alkali.

IPC 1-7 (main, further and additional classification)

C07C 37/06; C07C 37/07; C07C 39/235

IPC 8 full level (invention and additional information)

C07C 37/07 (2006.01); A01N 31/16 (2006.01); C07C 37/64 (2006.01); C07C 39/235 (2006.01)

CPC (invention and additional information)

C07C 37/64 (2013.01); C07C 2103/24 (2013.01)

Combination set (CPC)

C07C 37/64 + C07C 39/235

Citation (examination)

P.WANDELT: "The effect of 1,4-dihydro-9,10-dihydroxy-anthracene on soda and kraft cooking of pine", Paperi ja Puu - Papper och Trä, 1984, no. 11, pages 673 to 681

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

EP 0780356 A2 19970625; EP 0780356 A3 19970827; EP 0780356 B1 20000823; CA 2192924 A1 19970622; CA 2192924 C 20060815; DE 69609933 D1 20000928; DE 69609933 T2 20010301; JP 3804091 B2 20060802; JP H09169682 A 19970630; US 5750743 A 19980512

INPADOC legal status

2016-02-29 [PGFP FR] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: FR

- Ref Legal Event Code: PGFP

- Payment date: 20151110

- Year of fee payment: 20

2016-01-29 [PGFP GB] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: GB

- Ref Legal Event Code: PGFP

- Payment date: 20151202

- Year of fee payment: 20

2016-01-29 [PGFP DE] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: DE

- Ref Legal Event Code: PGFP

- Payment date: 20151201

- Year of fee payment: 20

2015-11-10 [REG FR PLFP] FEE PAYMENT

- Ref Country Code: FR

- Ref Legal Event Code: PLFP

- Year of fee payment: 20

2002-01-01 [REG GB IF02] EUROPEAN PATENT IN FORCE AS OF 2002-01-01

- Ref Legal Event Code: IF02

2001-08-08 [26N] NO OPPOSITION FILED

- Ref Legal Event Code: 26N

2000-10-13 [ET] FR: TRANSLATION FILED

- Ref Legal Event Code: ET

2000-09-28 [REF] CORRESPONDS TO:

- Ref Legal Event Code: REF

- Ref Document Number: 69609933

- Country of Ref Document: DE

- Date of Ref Document: 2000-09-28

2000-08-23 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB

1999-01-13 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 19981126

1998-01-28 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 19971128

1997-08-27 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB

1997-06-25 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB